This is a Mako Magazine Well Grip for a AR15 / M16 / M4 Tan. This Magwell grip gives you a natural fighting stance hold for better speed and accuracy. It creates a larger magazine well for faster magazine changes because your hand is already in position to drop the empty mag. This is a two piece design that goes around the magazine well and there is no gunsmithing required. Some weapons may require slight modification to the Mag Well Grip - some sanding or shaving of the inside lips of the Mag Well Grip may be required for a sure fit, but will fit most AR15 / M16 / M4 weapons.